The firemouth is pretty cool fish but I just really prefer the green terror and the acara seems to be just like it. Hopefully they will both get along so I can keep both
The firemouths mature quicker than a Acara/Green Terror, so if he is bigger and hits maturity, he may end up bullying him. So keep an eye out for that. If that happens you can move him out.
Honestly if you really like a green terror, get one. You can maybe upgrade your tank when it grows up and even if not it will have a better life than 50-60% of the households it would end up in (given how rarely people are warned about how big fishes get).
I believe the regular Acar is the PORT ACARA. Way smaller than the GT and way less agressive.
Hmm. Here the green terror is basically also called a neon Acara.
Had a couple of beautiful green terrors but they picked a fight with my 2 foot Pacu and that didn't end well for them.
I seemed to have had a fair bit of luck with my tank as it had Green Terrors, Firemouths, Oscars, Severums, Jewels and they seemed to live peacefully with each other.
My only guess is the Pacu who was the boss of the tank kept all their aggression in check and only the fool who picked a fight with the Pacu, ended up beaten or dead.